Expansion joint



July 9, 1929. s. w. MILLS, JR

EXPANSION JOINT Filed May 16. 1922 Patented July 9, 1929.

UNITED STATES PATENT oFFicE.

ononer. w. mints, .13., or CINCINNATI, 01110, ASSIGNOR To sum PHILIP canny MANU- FACTURING COMPANY, A CORPORATION or OHIO.

' EXPANSION JOINT.

Application filed Kay 16,

My invention relates to expansion or con-. traction joints for use in concrete, brick, wood block or similar construction in which a plastic material is used between sections of the constructionto permit expansion of the adjacent materials of adjacent sections and to keep the space between nomally filled when the adjacent sections have contracted.

Heretofore expansion joints for the same purpose have been made of a bituminous material, such as asphalt, with a strip of paper, felt, cardboard or similar material saturated or unsaturated with asphalt for the purpose of enabling the ready transportation and handling of the joint-and to prevent the joints when packed in crates or in cars from adhering together.

For some purposes a bituminous joint without an exterior reinforcement of felt, paper, metal, etc., is desirable but heretofore no satisfactory means have been found for. the handling of such a joint in packing and shipping.

I have discovered that by forming a strip of bituminous material or bituminous material and a fibrous filler or other suitable filler, into a strip of suitable length and thickness and coating it with a fluid material which when dry will form a film of nonadhesive material that the resultant product can be handled and boxed in bulk for shipment without the adjacent strips adherin". o

In the manufacture of my improved expansion joint I prepare the bituminous material or bituminous compound, strip to de sired form and size and then I apply to the surface the film of nonadhesive material, either by dipping the strip into a reservoir containing the film coating material, 01' b spraying a jet of the film coating materia or by applying the film coating material with a brush or otherwise.

I prefer to use as a film coating material any materialthat can be applied in a liquid or semiliquid condition and which will when dry give a thin coat or film ofnonadhesive material. I have found that such a film may be obtained by coating the strip with, among other suitable substances, parafiine, stearic acid, montan wax, or a soap solution formed of soap and water.

For some purposes I apply to the film be- 1922. Serial No. 561,406.

fore it has set a surfacing of soapstone, talc, mica or other similar fine particles.

If the joint is to be used where a bond is desired between the adjacentblocks and the joint I have found a satisfactory film is one that will be readily dissolved by moisture so as to permit adhesion between the blocks and the joint. Such a film may be obtained by using a soap solution.

In making my improved expansion joint I have found that-a great variety of mineral, animal or vegetable fats and waxes can be used but I have enumerated only a few of such material as any one skilled in the art may substitute others for those named Without departing from the spirit of my invention. Practically the only coating materials that will not be satisfactory would be those that would act as a solvent for the bituminous material or would so act as to give an adhesive or tacky coating.

In the drawings:

Fig. 1, I have shown a cross section of a body of bituminous material A having my coating B applied thereto;

In Fig. 2, I have shown a modification in which I have reinforced the bituminous material b a flexible elastic nondeteriorating material This reinforcement B may be arranged in the center of the body A or on one surface thereof or may be otherwise suitably arran ed to act as a reinforcement. This modification is coated with a film B of nonadhesive material and I have shown a portion removed to expose the reinforcement Claims: 1. An art cle of manufacture composed of a body of bituminous material hav ng a film .ofnon-adhesive water soluble material on its GEO. W. MILLS, JR. 

